30 Mr. C. J. Gahau on Longicorn Coleoptera 



Pachydissus {Margiles) hur.iilis (Chevr., MS.), sp. n. 



Fuscus : prothorace supra et lateraliter punctato-rugoso, pube grisea 

 Itlagiatim disposita ; lateribus leviter et subsequaliter rotundatis ; 

 elytris pieco-rufis, ruguloso-punctatis, pube cervina vel griseo- 

 fulva dense obtectis : apicibus subtruncato-rotundatis, inermibus ; 

 pedibus antennisque pieeo-ruris, illis ruguloso-punctatis, leviter 

 pubescentibus, his ( J ) eorpore paullo longioribus, articulis a prirao 

 ad quintum suba'qualibus, ceteris gradatim crescentibus, articulis 

 tertio et quarto erassatis, subcylindricis. 



Long. 14-15, lat. 3| mm. 



Hah. Senegal. 



This species may be easily distinguished from P. eijenus or 

 P. fulcidus by the more evenly rounded sides of the pro- 

 thorax, the greatest width of the latter being just behind the 

 middle, and by the relatively narrower elytra. The antenna) 

 in the male are shorter than in P. eyenus, with the third and 

 fourth joints much less strongly thickened. 



In one (female) specimen the pubescence of the elytra is 

 fawn-coloured and somewhat glossy ; in the other two (in 

 Mr. Fry's collection) it is dull and grey or fulvous ; but in 

 these I believe that it is faded. 



Pitchy dissus (Derolus) detnissus, Pasc. 



? Cerambyx volvulus, Fabr. Syst. Eleuth. ii. p. 271. 

 Hamaticheru8 volvulus, ]>ej. Cat. 



Piceus, griseo tenuiter pubescens ; oculis inagnis, supra (J) fere 

 contiguis ; prothorace lateribus in medio rotundatis singulisque 

 spatio angusto exciso, glabro ; dorso transversim plicato, in medio 

 raro levi ; elytris tenuiter sat denseque puuctulatis, subtilitor 

 pubcscentibus ; apicibus subtruncatis, inermibus; processu antero- 

 lateral metastcrni distincto : antcnnis( J) eorpore paullo longio- 

 ribus, subserratis, articulis tertio et quarto apice leviter nodosis, 

 quarto quam tertio paullo breviore. 



Long. 15-17, lat. 4-4£ mm. 



Ilab. India (Tranquebar, Nilghiris, Silhet), Philippines, 

 and China. 



This species was included by Mr. Pascoe in his proposed 

 genus Margites, but it seems better placed in Section C of the 

 preceding arrangement. The species is quoted by Dejean in 

 his Catalogue as the Cerambyx volvulus of Fabr., and it cer- 

 tainly agrees very well with Fabricius's description. 



Pachydissus [Derolus) arciferus (Chevr., MS.), sp. n. 

 Niger, griseo-pubescens ; capite supra inter oculos sat distincto 



